Some See Raiders' Donald Penn as Vulnerable

For the past four seasons, Donald Penn has been the foundation piece of the Raiders’ offensive line at left tackle.

He’s missed just two games during that span and twice been selected to the Pro Bowl. He’s also a leader of what some believe is one of the NFL’s best offensive lines, along with left guard Kelechi Osemele, center Rodney Hudson, right guard Gabe Jackson and – presumably – this year’s No. 1 pick Kolton Miller at right tackle.

But